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authorMichael Haggerty <mhagger@alum.mit.edu>2014-10-01 10:28:32 (GMT)
committerJunio C Hamano <gitster@pobox.com>2014-10-01 20:50:01 (GMT)
commitcf6950d3bfe1447ac04867b1f5654a2fc9c5db96 (patch)
tree2c99e3011a6e6f27286091a7066fe8c91683bcd1
parent3e88e8fc085bbfad142d51a07ef918b9b5ca1d72 (diff)
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lockfile: change lock_file::filename into a strbuf
For now, we still make sure to allocate at least PATH_MAX characters for the strbuf because resolve_symlink() doesn't know how to expand the space for its return value. (That will be fixed in a moment.) Another alternative would be to just use a strbuf as scratch space in lock_file() but then store a pointer to the naked string in struct lock_file. But lock_file objects are often reused. By reusing the same strbuf, we can avoid having to reallocate the string most times when a lock_file object is reused. Helped-by: Torsten Bögershausen <tboegi@web.de> Signed-off-by: Michael Haggerty <mhagger@alum.mit.edu> Signed-off-by: Junio C Hamano <gitster@pobox.com>
-rw-r--r--builtin/commit.c12
-rw-r--r--builtin/reflog.c2
-rw-r--r--cache.h2
-rw-r--r--config.c14
-rw-r--r--lockfile.c53
-rw-r--r--read-cache.c4
-rw-r--r--refs.c6
-rw-r--r--shallow.c6
8 files changed, 47 insertions, 52 deletions
diff --git a/builtin/commit.c b/builtin/commit.c
index 70f5935..f55e809 100644
--- a/builtin/commit.c
+++ b/builtin/commit.c
@@ -341,7 +341,7 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
die(_("unable to create temporary index"));
old_index_env = getenv(INDEX_ENVIRONMENT);
- setenv(INDEX_ENVIRONMENT, index_lock.filename, 1);
+ setenv(INDEX_ENVIRONMENT, index_lock.filename.buf, 1);
if (interactive_add(argc, argv, prefix, patch_interactive) != 0)
die(_("interactive add failed"));
@@ -352,7 +352,7 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
unsetenv(INDEX_ENVIRONMENT);
discard_cache();
- read_cache_from(index_lock.filename);
+ read_cache_from(index_lock.filename.buf);
if (update_main_cache_tree(WRITE_TREE_SILENT) == 0) {
if (reopen_lock_file(&index_lock) < 0)
die(_("unable to write index file"));
@@ -362,7 +362,7 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
warning(_("Failed to update main cache tree"));
commit_style = COMMIT_NORMAL;
- return index_lock.filename;
+ return index_lock.filename.buf;
}
/*
@@ -385,7 +385,7 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
if (write_locked_index(&the_index, &index_lock, CLOSE_LOCK))
die(_("unable to write new_index file"));
commit_style = COMMIT_NORMAL;
- return index_lock.filename;
+ return index_lock.filename.buf;
}
/*
@@ -472,9 +472,9 @@ static const char *prepare_index(int argc, const char **argv, const char *prefix
die(_("unable to write temporary index file"));
discard_cache();
- read_cache_from(false_lock.filename);
+ read_cache_from(false_lock.filename.buf);
- return false_lock.filename;
+ return false_lock.filename.buf;
}
static int run_status(FILE *fp, const char *index_file, const char *prefix, int nowarn,
diff --git a/builtin/reflog.c b/builtin/reflog.c
index e8a8fb1..7c78b15 100644
--- a/builtin/reflog.c
+++ b/builtin/reflog.c
@@ -431,7 +431,7 @@ static int expire_reflog(const char *ref, const unsigned char *sha1, int unused,
write_str_in_full(lock->lock_fd, "\n") != 1 ||
close_ref(lock) < 0)) {
status |= error("Couldn't write %s",
- lock->lk->filename);
+ lock->lk->filename.buf);
unlink(newlog_path);
} else if (rename(newlog_path, log_file)) {
status |= error("cannot rename %s to %s",
diff --git a/cache.h b/cache.h
index c2ea6f1..f81d95f 100644
--- a/cache.h
+++ b/cache.h
@@ -580,7 +580,7 @@ struct lock_file {
volatile int fd;
volatile pid_t owner;
char on_list;
- char filename[PATH_MAX];
+ struct strbuf filename;
};
#define LOCK_DIE_ON_ERROR 1
#define LOCK_NODEREF 2
diff --git a/config.c b/config.c
index 123ed29..2110779 100644
--- a/config.c
+++ b/config.c
@@ -2024,9 +2024,9 @@ int git_config_set_multivar_in_file(const char *config_filename,
MAP_PRIVATE, in_fd, 0);
close(in_fd);
- if (chmod(lock->filename, st.st_mode & 07777) < 0) {
+ if (chmod(lock->filename.buf, st.st_mode & 07777) < 0) {
error("chmod on %s failed: %s",
- lock->filename, strerror(errno));
+ lock->filename.buf, strerror(errno));
ret = CONFIG_NO_WRITE;
goto out_free;
}
@@ -2106,7 +2106,7 @@ out_free:
return ret;
write_err_out:
- ret = write_error(lock->filename);
+ ret = write_error(lock->filename.buf);
goto out_free;
}
@@ -2207,9 +2207,9 @@ int git_config_rename_section_in_file(const char *config_filename,
fstat(fileno(config_file), &st);
- if (chmod(lock->filename, st.st_mode & 07777) < 0) {
+ if (chmod(lock->filename.buf, st.st_mode & 07777) < 0) {
ret = error("chmod on %s failed: %s",
- lock->filename, strerror(errno));
+ lock->filename.buf, strerror(errno));
goto out;
}
@@ -2230,7 +2230,7 @@ int git_config_rename_section_in_file(const char *config_filename,
}
store.baselen = strlen(new_name);
if (!store_write_section(out_fd, new_name)) {
- ret = write_error(lock->filename);
+ ret = write_error(lock->filename.buf);
goto out;
}
/*
@@ -2256,7 +2256,7 @@ int git_config_rename_section_in_file(const char *config_filename,
continue;
length = strlen(output);
if (write_in_full(out_fd, output, length) != length) {
- ret = write_error(lock->filename);
+ ret = write_error(lock->filename.buf);
goto out;
}
}
diff --git a/lockfile.c b/lockfile.c
index 1dd118f..85c8648 100644
--- a/lockfile.c
+++ b/lockfile.c
@@ -47,9 +47,9 @@
* failed attempt to lock, or a failed close_lock_file()). In this
* state:
* - active is unset
- * - filename[0] == '\0' (usually, though there are transitory states
- * in which this condition doesn't hold). Client code should *not*
- * rely on this fact!
+ * - filename is empty (usually, though there are transitory
+ * states in which this condition doesn't hold). Client code should
+ * *not* rely on the filename being empty in this state.
* - fd is -1
* - the object is left registered in the lock_file_list, and
* on_list is set.
@@ -170,13 +170,6 @@ static char *resolve_symlink(char *p, size_t s)
/* Make sure errno contains a meaningful value on error */
static int lock_file(struct lock_file *lk, const char *path, int flags)
{
- /*
- * subtract LOCK_SUFFIX_LEN from size to make sure there's
- * room for adding ".lock" for the lock file name:
- */
- static const size_t max_path_len = sizeof(lk->filename) -
- LOCK_SUFFIX_LEN;
-
if (!lock_file_list) {
/* One-time initialization */
sigchain_push_common(remove_lock_file_on_signal);
@@ -191,30 +184,32 @@ static int lock_file(struct lock_file *lk, const char *path, int flags)
lk->fd = -1;
lk->active = 0;
lk->owner = 0;
- lk->filename[0] = 0;
+ strbuf_init(&lk->filename, PATH_MAX);
lk->next = lock_file_list;
lock_file_list = lk;
lk->on_list = 1;
+ } else if (lk->filename.len) {
+ /* This shouldn't happen, but better safe than sorry. */
+ die("BUG: lock_file(\"%s\") called with improperly-reset lock_file object",
+ path);
}
- if (strlen(path) >= max_path_len) {
- errno = ENAMETOOLONG;
- return -1;
+ strbuf_addstr(&lk->filename, path);
+ if (!(flags & LOCK_NODEREF)) {
+ resolve_symlink(lk->filename.buf, lk->filename.alloc);
+ strbuf_setlen(&lk->filename, strlen(lk->filename.buf));
}
- strcpy(lk->filename, path);
- if (!(flags & LOCK_NODEREF))
- resolve_symlink(lk->filename, max_path_len);
- strcat(lk->filename, LOCK_SUFFIX);
- lk->fd = open(lk->filename, O_RDWR | O_CREAT | O_EXCL, 0666);
+ strbuf_addstr(&lk->filename, LOCK_SUFFIX);
+ lk->fd = open(lk->filename.buf, O_RDWR | O_CREAT | O_EXCL, 0666);
if (lk->fd < 0) {
- lk->filename[0] = 0;
+ strbuf_reset(&lk->filename);
return -1;
}
lk->owner = getpid();
lk->active = 1;
- if (adjust_shared_perm(lk->filename)) {
+ if (adjust_shared_perm(lk->filename.buf)) {
int save_errno = errno;
- error("cannot fix permission bits on %s", lk->filename);
+ error("cannot fix permission bits on %s", lk->filename.buf);
rollback_lock_file(lk);
errno = save_errno;
return -1;
@@ -313,7 +308,7 @@ int reopen_lock_file(struct lock_file *lk)
die(_("BUG: reopen a lockfile that is still open"));
if (!lk->active)
die(_("BUG: reopen a lockfile that has been committed"));
- lk->fd = open(lk->filename, O_WRONLY);
+ lk->fd = open(lk->filename.buf, O_WRONLY);
return lk->fd;
}
@@ -329,9 +324,9 @@ int commit_lock_file(struct lock_file *lk)
return -1;
/* remove ".lock": */
- strbuf_add(&result_file, lk->filename,
- strlen(lk->filename) - LOCK_SUFFIX_LEN);
- err = rename(lk->filename, result_file.buf);
+ strbuf_add(&result_file, lk->filename.buf,
+ lk->filename.len - LOCK_SUFFIX_LEN);
+ err = rename(lk->filename.buf, result_file.buf);
strbuf_reset(&result_file);
if (err) {
int save_errno = errno;
@@ -341,7 +336,7 @@ int commit_lock_file(struct lock_file *lk)
}
lk->active = 0;
- lk->filename[0] = 0;
+ strbuf_reset(&lk->filename);
return 0;
}
@@ -359,8 +354,8 @@ void rollback_lock_file(struct lock_file *lk)
return;
if (!close_lock_file(lk)) {
- unlink_or_warn(lk->filename);
+ unlink_or_warn(lk->filename.buf);
lk->active = 0;
- lk->filename[0] = 0;
+ strbuf_reset(&lk->filename);
}
}
diff --git a/read-cache.c b/read-cache.c
index af69f34..91bf876 100644
--- a/read-cache.c
+++ b/read-cache.c
@@ -2044,10 +2044,10 @@ static int commit_locked_index(struct lock_file *lk)
if (alternate_index_output) {
if (close_lock_file(lk))
return -1;
- if (rename(lk->filename, alternate_index_output))
+ if (rename(lk->filename.buf, alternate_index_output))
return -1;
lk->active = 0;
- lk->filename[0] = 0;
+ strbuf_reset(&lk->filename);
return 0;
} else {
return commit_lock_file(lk);
diff --git a/refs.c b/refs.c
index a415131..598f4eb 100644
--- a/refs.c
+++ b/refs.c
@@ -2607,8 +2607,8 @@ static int delete_ref_loose(struct ref_lock *lock, int flag)
* lockfile name, minus ".lock":
*/
char *loose_filename = xmemdupz(
- lock->lk->filename,
- strlen(lock->lk->filename) - LOCK_SUFFIX_LEN);
+ lock->lk->filename.buf,
+ lock->lk->filename.len - LOCK_SUFFIX_LEN);
int err = unlink_or_warn(loose_filename);
free(loose_filename);
if (err && errno != ENOENT)
@@ -2972,7 +2972,7 @@ int write_ref_sha1(struct ref_lock *lock,
write_in_full(lock->lock_fd, &term, 1) != 1 ||
close_ref(lock) < 0) {
int save_errno = errno;
- error("Couldn't write %s", lock->lk->filename);
+ error("Couldn't write %s", lock->lk->filename.buf);
unlock_ref(lock);
errno = save_errno;
return -1;
diff --git a/shallow.c b/shallow.c
index 57f4afa..4919baf 100644
--- a/shallow.c
+++ b/shallow.c
@@ -269,8 +269,8 @@ void setup_alternate_shallow(struct lock_file *shallow_lock,
if (write_shallow_commits(&sb, 0, extra)) {
if (write_in_full(fd, sb.buf, sb.len) != sb.len)
die_errno("failed to write to %s",
- shallow_lock->filename);
- *alternate_shallow_file = shallow_lock->filename;
+ shallow_lock->filename.buf);
+ *alternate_shallow_file = shallow_lock->filename.buf;
} else
/*
* is_repository_shallow() sees empty string as "no
@@ -316,7 +316,7 @@ void prune_shallow(int show_only)
if (write_shallow_commits_1(&sb, 0, NULL, SEEN_ONLY)) {
if (write_in_full(fd, sb.buf, sb.len) != sb.len)
die_errno("failed to write to %s",
- shallow_lock.filename);
+ shallow_lock.filename.buf);
commit_lock_file(&shallow_lock);
} else {
unlink(git_path("shallow"));